As there was no provenance listed in the DNW sale, it's possible that the vendor did not supply any. He/she may not have had any. It's possible that they came by it by accident, by inheritance, by dishonest means, etc etc. If it were in the state pictured above, a non-numismatist would probably be pleased to clean it up to the shiny state and get over a thousand pounds for it. So, not necessarily an idiot per se but who knows ?